Analysis and optimization of noise in bipolar RF harmonic mixers

Author

Helmy, Ahmed ; Sharaf, Khaled ; Ragai, Hani

Author_Institution

Integrated Circuit Lab, Ain Shams Univ., Cairo, Egypt

Volume

2

fYear

2001

fDate

2001

Firstpage

829

Abstract

A noise analysis of bipolar harmonic mixers (BHM) used for direct conversion receivers is presented in this paper. Analytical and simulated results for the transfer function of the mixer are presented. Simple analytical expressions describing noise contribution from all sources are derived. Estimation of flicker noise agrees nearly with the harmonic-balance simulation results. Based on the derived expressions, total time average noise power spectral density (PSD) at the output is compared with simulation results. For the recommended regions of operation, error is less than 20%. The overall BHM noise figure (NF) is calculated and optimized based on a simple extracted formula. Errors introduced by analysis remain within a 1.5-dB margin with respect to simulation results

Keywords

bipolar transistor circuits; circuit noise; circuit optimisation; flicker noise; mixers (circuits); nonlinear network analysis; transfer functions; bipolar harmonic mixers; direct conversion receivers; flicker noise; harmonic-balance simulation; mixer transfer function; noise analysis; noise optimization; noise power spectral density; 1f noise; Analytical models; Harmonic analysis; Integrated circuit noise; Noise figure; Noise measurement; Radio frequency; Thermal resistance; Transfer functions; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2001. MWSCAS 2001. Proceedings of the 44th IEEE 2001 Midwest Symposium on

Conference_Location

Dayton, OH

Print_ISBN

0-7803-7150-X

Type

conf

DOI

10.1109/MWSCAS.2001.986315

Filename

986315